Heat 1 tablespoon of oil in a non-stick wok over high heat. Add half the beef and stir-fry until brown. Set aside. Add another tablespoon of oil and beef. Cook until brown. Remove and set aside. Heat remaining oil in wok and add onion, garlic and chilli and stir-fry 1 minute or until soft.

Add broccolini and stock and stir-fry until broccolini is just tender.